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Transcontinental Gas Pipe Line Company, LLC

PA DEP Section 401 Water Quality Certification Application

Module S1 – Project Summary

Leidy South Project

August 2019

Leidy South Project PA DEP Section 401 Water Quality Certification Application Module S1 – Project Summary Transcontinental Gas Pipe Line Company, LLC

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TABLE OF CONTENTS

Module S1- Project Summary

S1.A Project Description S1.A.1(i) Comprehensive Environmental Assessment S1.A.1(ii) Nature and Extent of Overall Project and Anticipated Timeline

S1.A.1(iii) List of Chapter 105 Applications associated with Overall Project S1.A.1(iv) Summary of Overall Project Impacts S1.B Additional Information

S1.B.1 Purpose and Need S1.B.2 Water Dependency S1.B.3 Aquatic Resource Summary Table S1.B.4 Summary of Proposed Project Impacts

References Figure 1.1-1 – Leidy South Project Location Map

Leidy South Project PA DEP 401 Water Quality Certification Application Transcontinental Gas Pipe Line Company, LLC Environmental Assessment Module S1 – Project Summary

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MODULE S1 PROJECT SUMMARY

Transcontinental Gas Pipe Line Company, LLC (Transco), a subsidiary of The Williams

Companies, Inc. is submitting an application to the Pennsylvania Department of Protection

(PADEP) for a Section 401 Water Quality Certificate under the Federal Clean Water Act guideline

for Project related impacts to Waters of the United States subject to jurisdiction under Section 404

of the Clean Water Act and subject to PA Code Title 25 Chapter 105. The following provides an

overall summary of the project scope as defined in Module S1 of the Environmental Assessment

Form.

S1.A Project Description Transco is proposing the Leidy South Project (Project). The Project is an expansion of

Transco’s existing natural gas transmission system and an extension of Transco’s system through

a capacity lease with National Fuel Gas Supply Corporation. The Project will enable Transco to

provide 582,400 dekatherms per day (Dth/d) of incremental firm transportation capacity for

abundant supplies of natural gas from northern and western Pennsylvania to existing and growing

markets in Transco’s Zone 6. Transco’s Zone 6 includes the portion of the Transco system in

Pennsylvania, New York, New Jersey, and Maryland. The Project consists of the following

components:

• 6.3 miles of 36-inch pipeline loop along Transco’s Leidy Line in Clinton County,

Pennsylvania (Hensel Replacement) and the related abandonment of 5.8 miles

of existing 23.375-inch pipeline on Leidy Line A;

• 2.4 miles of 36-inch pipeline loop along Transco’s Leidy Line in Clinton County,

Pennsylvania (Hilltop Loop);

• 3.5 miles of 42-inch pipeline loop along Transco’s Leidy Line in Lycoming

County, Pennsylvania (Benton Loop);

• Existing Compressor Station 605 (Wyoming County, Pennsylvania);

o Increase the total certificated horsepower of the two electric motor-driven

units from 30,000 horsepower (HP) to 42,000 HP and modifications to

existing coolers;


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• New Compressor Station 607 (Luzerne County, Pennsylvania);

o Install two gas turbine-driven compressor units (23,465 nominal HP at

International Organization for Standardization [ISO] conditions each,

46,930 HP total) and gas coolers;

• Existing Compressor Station 610 (Columbia County, Pennsylvania);

o Add one gas turbine-driven compressor unit (31,871 nominal HP at ISO

conditions) and gas cooling;

o Increase the total certificated horsepower of the two electric motor-driven

units from 40,000 HP to 42,000 HP and re-wheel the existing

compressors;

• New Compressor Station 620 (Schuylkill County, Pennsylvania);

o Install one gas turbine-driven compressor unit (31,871 nominal HP at ISO

conditions);

• Ancillary facilities, such as mainline valves (MLVs), communication facilities,

cathodic protection and pig launchers and receivers in Pennsylvania.

Subject to the Federal Energy Regulatory Commission (FERC) approval of the Project

and receipt of the necessary permits and authorizations, Transco anticipates that construction of

the Project will commence in winter 2020/2021 to meet a target in-service date of December 1,

2021.

S1.A.1 Project Counties and Phases The Project will take place within Clinton, Columbia, Luzerne, Lycoming, Wyoming, and

Schuylkill counties, Pennsylvania, as outlined in Figure 1.1-1 – Leidy South Project Location Map.

Chapter 105/Section 404 Joint Permit Applications will be submitted for impacts to waters of the

Commonwealth for the Hensel Replacement and Hilltop Loop within Clinton County, the Benton

Loop within Lycoming County, and Compressor Station 607 within Luzerne County. The Project

will not impact waters of the Commonwealth in Columbia, Wyoming and Schuylkill counties. The

Project will not have any earth disturbance within Wyoming County. The Project will not be

completed in Phases, as all Project components will be constructed to meet the target in-service

date.


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S1.A.1(i) Comprehensive Environmental Assessment

The proposed Project qualifies for the Comprehensive Environmental Assessment (CEA)

due to the Project impacts being in multiple counties. As part of the CEA, Transco analyzed

alternatives, impacts, mitigation and antidegradation for all structures and activities associated

with the Project, including the cumulative impact of the Project and other existing and potential

projects. The alternatives analysis for the Project can be found in Module 3, Appendix S3-4

Alternatives Analysis. The alternatives address energy source and systems analysis evaluated

for the Project. Within the systems analysis various design options and routes were considered

to determine the proposed Project design. Project impacts are discussed within Module S3,

where impacts to resources are quantified, and impacts to threatened, endangered, or species of

special concern are addressed. Proposed mitigation for the Project can be found within Module

S4. Proposed mitigation measures described in this section include the avoidance and

minimization measures proposed as part of the Project, and plans for onsite and offsite mitigation,

as it relates to wetlands and riparian buffers. Antidegradation measures for the Project are found

in Module 3, Section S3.E.

S1.A.1(ii) Nature, Extent, and Timeline of Project Subject to FERC approval of the Project and receipt of the necessary permits and

authorizations, Transco anticipates that construction of the Project will commence in winter

2020/2021 to meet a target in-service date of December 1, 2021.

General Construction Techniques

Transco will use conventional techniques for buried pipeline construction to ensure safe,

stable, and reliable transmission facilities, consistent with Commission and USDOT

specifications. Construction of the proposed pipelines will follow a set of sequential operations,

unique to the pipeline industry. The Project will require multiple construction spreads that will

proceed along the pipeline Right of Ways in one continuous operation. The entire process will be

coordinated in such a manner as to minimize the total time a tract of land is disturbed and,

therefore, susceptible to erosion and/or temporarily precluded from its normal use.

Areas requiring special construction plans and techniques may include road or utility

crossings, waterbodies and wetlands, unusual topographies associated with unstable soils and

trench conditions, residential or urban areas, agricultural areas, areas requiring rock removal, and


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permanent recreation facilities, among others. Typically, pipeline construction will take place in

the following order:

• Surveying and Staking

• Installation of Erosion and Sediment Controls

• Clearing, Grading, and Fencing

• Trenching

• Pipe Stringing

• Pipe Bending

• Pipe Assembly and Welding

• X-Ray and Weld Repair

• Coating Field Welds, Inspection, and Repair

• Pipe Preparation and Lowering-In

• Tie-Ins

• Padding, Backfilling, and Grade Restoration

• Clean-up and Restoration

• Hydrostatic Testing

Specialized Construction Techniques

In addition to conventional pipeline construction techniques, specialized construction

techniques will be utilized in sensitive resource areas, including waterbody and wetland crossings

or in areas with construction constraints, such as residential areas, road crossings, utility

crossings, areas with side slopes, and rocky areas. These construction methods will be outlined

in Chapter 102 and 105 permit submittals.

S1.A.1(iii) List of Chapter 105 Applications associated with Overall Project Transco will submit three Chapter 105 Joint Permit Applications for the Project. One

application will be submitted for the Hensel Replacement and Hilltop Loop, both of which will take

place in Clinton County. A second application will be submitted for the Benton Loop which is

located in Lycoming County. The third application will be submitted for Compressor Station 607

which is located in Luzerne County.


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S1.A.1(iv) Summary of Overall Project Impacts As part of the Project, unavoidable wetland and watercourses impacts are anticipated to

occur. No net loss of wetlands will occur as a result of the proposed Project as Transco proposes

to offset impacts through onsite restoration and offsite compensatory wetland mitigation.

Mitigation is discussed in greater detail in Module 4, Appendix S4-1. In all instances, impacts have

been minimized or avoided to the greatest extent practicable. A summary of the overall known

impacts is provided in Table S1.A.1-1. There are no proposed water resources impacts in

Columbia, Wyoming, and Schuylkill counties. There are no anticipated future impacts associated

with the overall Project.

Table S1.A.1-1 Aquatic Resource Impact Summary Table

Project Component Impact Type Resource Direct (Acres)

Indirect (Acres)

Benton Loop (Lycoming County)

Permanent Wetland - 1.52

Watercourse - 0.45

Temporary Wetland - 1.12

Watercourse - 0.94

Hilltop Loop (Clinton County)


Watercourse - 1.05


Watercourse - 1.00

Hensel Replacement (Clinton County)

Permanent Wetland 0.02 1.34

Watercourse - 1.72


Watercourse - 0.42

Compressor Station 607 (Luzerne County)

Permanent Wetland 0.20 -

Watercourse - -


Watercourse - -


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Table S1.A.1-1 Aquatic Resource Impact Summary Table


Indirect (Acres)

Notes:

1. Watercourse impacts include floodway impacts

S1.B Additional Information S1.B.1 Purpose and Need

Transco proposes to construct and operate the Project facilities to provide an incremental

582,400 Dth/d of year-round firm transportation capacity from the Marcellus and Utica Shale

production areas in northern and western Pennsylvania to Transco’s mainline at the River Road

Regulator Station in Lancaster County, Pennsylvania. As a result of Transco’s negotiations with

two anchor shippers and Transco’s Open Season for the Project that was held from October 9,

2018 through October 29, 2018, Transco has executed long-term, binding precedent agreements

with three shippers for all of the 582,400 Dth/d of firm transportation capacity under the Project,

as detailed in Table S1.B.1-1.

Table S1.B.1-1 Transco’s Customers and Transportation Capacity Subscribed to the Project

Shipper Transportation Contract Quantity (Dth/d) Cabot Oil & Gas Corporation 250,000

Seneca Resources Corporation 330,000

UGI Utilities, Incorporated D/B/A UGI North 2,400 Key: Dth/d = dekatherms per day

The Project will provide Transco’s customers and the markets they serve with greatly

enhanced access to Marcellus and Utica Shale supplies providing users, such as power

generators, access to clean, abundant, and lower priced natural gas as a better alternative to coal

and oil. Access to the Marcellus and Utica Shale production areas is currently constrained on

days where natural gas demand is the highest on the interstate pipeline systems by existing

pipeline capacity. By increasing gas supply access at the River Road Regulator Station, the

Project will support overall reliability and diversification of energy infrastructure along the Atlantic


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seaboard. The increased Project capacity further diversifies energy infrastructure by increasing

the system’s ability to meet growing northeast and southeast demand from the Marcellus and

Utica in addition to gas historically produced in other areas of the United States. Moreover, the

Project will benefit the public by promoting competitive markets and increasing the security of

natural gas supplies to major delivery points serving the Atlantic seaboard.

A review of the Annual Energy Outlook 2018 (Energy Information Administration 2018)

reference case indicates that natural gas consumption is expected to rise from 26 trillion cubic

feet (Tcf) in 2018 to 34 Tcf in 2040 and will continue to grow to 35 Tcf in 2050. Therefore,

Transco’s proposal is consistent with expected market demand and the needs expressed by

Transco’s customers in the binding precedent agreements that have been executed for this

additional capacity (see Table S1.B.1-1). As such, and as explained more fully in Transco’s

Certification Application, the Project is consistent with the Commission’s Statement of Policy on

the Certification of New Interstate Natural Gas Pipeline Facilities.

S1.B.2 Water Dependency Based on the Project purpose and need presented above, the Project was sited to avoid

and minimize impacts to resources. Due to the linear nature of the FERC regulated interstate

pipeline Project and required above ground facilities, the Project is considered water dependent

as unavoidable impacts to resources are proposed for the Project.

S1.B.3 Aquatic Resource Summary Table Wetland and Watercourse Delineations were conducted during Fall 2018 and Spring 2019.

A summary of the resources located within the investigation area is provided in Table S1-B.3-1.

Flow regimes are noted in the table below, which include ephemeral, intermittent, and perennial

streams. Cowardin wetland classifications are also noted which include Palustrine Emergent

(PEM), Palustrine Scrub-Shrub (PSS), Palustrine Forested (PFO), and Palustrine Open-water

(POW).

Table S1.B.3-1 Aquatic Resource Summary Table

Project Component

Resource Type

Cowardin Class / Stream Type Number Delineated

Total Area Delineated

(Acres)

Benton Loop Wetland PEM 27 6.9

PSS 1 0.11


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Project Component

Resource Type



(Acres) PFO 18 3.83

POW 2 0.51

Watercourse

Intermittent 4 0.07

Ephemeral 16 0.32

Perennial 16 1.41

Hilltop Loop

Wetland

PEM 13 3.41

PSS 1 0.04

PFO 8 3.94

POW 2 0.08

Watercourse

Intermittent 6 0.56

Ephemeral 7 0.11

Perennial 2 1.19

Hensel Replacement

Wetland

PEM 23 14.17

PSS 7 20.16

PFO 20 43.61

POW 1 0.05

Watercourse

Intermittent 18 0.26

Ephemeral 10 0.11

Perennial 9 2.49

Compressor Station 607 Wetland

PEM 10 4.22

PSS 1 0.02

PFO 2 1

POW 0 0

Watercourse Intermittent 8 0.61


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Project Component

Resource Type



(Acres) Ephemeral 1 0.01

Perennial 0 0

Compressor Station 620

Wetland

PEM 2 1.72

PSS 0 0

PFO 1 3.39

POW 0 0

Watercourse

Intermittent 1 0.05

Ephemeral 1 0.01

Perennial 1 2.16

For detailed information on each specific resource identified as part of the Project, see

Module 2, Appendix S2-1.

S1.B.4 Summary of Proposed Project Impacts A summary of the proposed Project permanent and temporary direct and indirect impacts

is provided in Table S1.B.4-1. The table is broken out by each Project component where resource

impacts are proposed. Further detail regarding the impacts at each specific resource can be

found in Module S3.A.

Table S1.B.4-1 Aquatic Resource Impact Summary Table


Indirect (Acres)

Benton Loop (Lycoming County)


Watercourse - 0.45


Watercourse - 0.94

Hilltop Loop (Clinton County)



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Table S1.B.4-1 Aquatic Resource Impact Summary Table


Indirect (Acres)

Watercourse - 1.05


Watercourse - 1.00

Hensel Replacement (Clinton County)

Permanent Wetland 0.02 1.34

Watercourse - 1.72


Watercourse - 0.42

Compressor Station 607 (Luzerne County)

Permanent Wetland 0.20 -

Watercourse - -


Watercourse - -

Notes:

1. Watercourse impacts include floodway impacts


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References Cowardin LM, Carter V, Golet FC, LaRoe ET. 1979. Classification of wetlands and deepwater

habitats of the United States. U.S. Fish & Wildlife Service Pub. FWS/OBS-79/31,

Washington, DC.

Environmental Laboratory. 1987. Corps of Engineers Wetlands Delineation Manual. Technical

Report Y-87-1. U.S. Army Engineer Waterways Experiment Station, Vicksburg, MS.

FERC Online eLibrary.

https://elibrary.ferc.gov/idmws/file_list.asp?accession_num=20190731-5049

Natural Resource Conservation Service (NRCS). 2018. United States Department of

Agriculture. Soil Survey Geographic (SSURGO) Database for Pennsylvania. Available

at: http://datagateway.nrcs.usda.gov.

The Pennsylvania Code. Title 25 Environmental Protection, Chapter 93. Water Quality Standards.

(PACODE) Available online at

https://www.pacode.com/secure/data/025/chapter93/chap93toc.html. Accessed June

2019

The Pennsylvania Code. Title 25 Environmental Protection, Chapter 105. Water Quality

Standards. (PACODE) Available online at


2019

The Pennsylvania Code. Title 25 Environmental Protection, Chapter 102. Water Quality

Standards. (PACODE) Available online at


2019

U.S. Fish and Wildlife Service (USFWS). 2016. National Wetlands Inventory website. U.S.

Department of the Interior, Fish and Wildlife Service, Washington, D.C.

http://www.fws.gov/wetlands/

https://elibrary.ferc.gov/idmws/file_list.asp?accession_num=20190731-5049

http://datagateway.nrcs.usda.gov/

https://www.pacode.com/secure/data/025/chapter93/chap93toc.html.%20Accessed%20June%202019




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